cc: Remove SetMemoryPolicy from OutputSurface and Display.

cc/surfaces/display_unittest.cc

Index: cc/surfaces/display_unittest.cc
diff --git a/cc/surfaces/display_unittest.cc b/cc/surfaces/display_unittest.cc
index 09cf73971ba82f68cc72f244e24a4454662a63ea..30477f8069a102dc1ed9949d3f440d22305979a8 100644
--- a/cc/surfaces/display_unittest.cc
+++ b/cc/surfaces/display_unittest.cc
@@ -164,7 +164,6 @@ class DisplayTest : public testing::Test {
 class StubDisplayClient : public DisplayClient {
  public:
   void DisplayOutputSurfaceLost() override {}
-  void DisplaySetMemoryPolicy(const ManagedMemoryPolicy& policy) override {}
   void DisplayWillDrawAndSwap(bool will_draw_and_swap,
                               const RenderPassList& render_passes) override {}
   void DisplayDidDrawAndSwap() override {}